Improvement in damper-regulators



. 2 Shets-Sheet I. J. H MURRILL.

Damper Regulator. I I No. 107,948. Patented 0m. '4, 1870..

2 Sheets-Sheet 2 Patented Oct. 4, 1870.

Invew "1'- J. H. MURRILL Damper Regulator.

eration. A V p A A A A, fig. 2, represents asection of the base plate of erate,

t, dttiflitr.

A JAMES HQFMURRILLQF BALTIMORE, MARYLAND, Assienoaro HIMS LF" Ann LEWIsj' KEIZER, 0 SAME PLAoE. A

"Letters Patent lilo. 107,948, dated October 4,1870.

IMPROVEMENT IN DAMPER-REGULATORS.

The scliedule referred to in these Letters Patent andmaking part of the same To all whontit may concern:

Be it known that-I, JAMEs H. MERRI L, of Bal- Utimore, Maryland, have invented a .new and useful Improvement in Damper-Regulators for Steam-Boilers; and I do hereby declare that the following is a full and exact description thereof, re'ference being' hadto the accompanying drawing, in 'which Figure l is a plan view, and Figure 2 a side elevation, showing the working parts insection, A A Damper-regulators, in which a flexible diaphragm of rubber or other material is used,have long been A known, but much difliculty has been experienced in practice from the excessivestrain upon the rubber,

A causing 'it eventually to' give way; and

The nature of my invention consists in effectually protecting the diaphragm by a series of hinged flaps, which move in unison with it,.receiv'e the strain, and transfer its motion tot-he lever through suitable connecting-rods, so arranged as to relieve theworking parts of friction, andrender the apparatus sensitive to slight changes of pressure.

To enable others'skilled inthe art to make and use my invention, I will describe its construction and op fllBIiIlflGhiIlG, having a quadrangular depression, B,

i in .which the diaphragm rests when not inaction.

O is ,the flexible diaphragm,- preferably of sheetrubher, which is firmly clamped to the base plate "by a ring, D, having a square opening through it, as shown. l A

. E is an opening for the admission of steam between thebase plate and diaphragm. p I

" F F are. four metal flaps, resting upon the diaphragm, and having theirouter sides pivoted by knifeedges-and =V-grooves to the under side of ring D,

asshown at GG.

These flaps are, inform, right-angled triangles,

their'apexes joining in the center, forming arsquare.

If steam be now admitted through pipe E, under 1 diaphragm C, it will be raised, the central portion A having the. greatest movement; the'fiapsF F'being pivoted atthe samepoints at' which the diaphragm is held, more entirely in unison with it, thus allowing A freedom of action withoutfrictionor undue strain.

The motion of diaphragm and flaps is communicated to the lever by the use of four short rods H H,

A pointed at both ends, one end of each rod restingin A engagiugwith. a'correspjonding V-groove in the un- A dqr side of lever 'K,whicl1' isjpivoted at L on knifeedges, and works betwecn'jaws or guides in the arch J. M is a counterweight, which may .beadj usted bya set-screw to any position onlever required by the desired pressure. A

N is a hole, for the receptio'n of the damper-rod.

' The machine being connected with the boiler bya suitable pipe, (preferably attached below the waterline, to avoid contact of steam or hot water with the diaphragm) and the damper-rod being connected with lever, theoperation is thus: g a

The counlerweight'is set on lever to the required pressure, say fifty pounds per square inch, and as the steam rises, there is an increasing tendency to raise the diaphragm and flaps in opposition to the action,

of counterweight M.

On approaching the desired pressure, the resistance is'finally overcome, and the lever gradually raised, more or less closing the damper. A

As the pressure, and consequent power in sustaining the weight, decreases, the lever gradually falls,

and the damper is opened, the rising and falling of stitute'the chief features of my invention, whichal claim secures the desired object more effectually than any similar device yet produced.

It is evident that any number of flaps above three may be employed, insteadof four, which number -I have adopted as securing the most simple construction and desirable form. I therefore do not limit myself ;to any particular number or arrangement;

I am aware that.damper-regulators have been constructed with flexible diaphragms, protected by metallic backing. I therefore do not broadly claim this as'a distinctive feature; but, having fully described my invention,

What I claim, and desire to secure by Letters Patent is- A A 1 Pivoting the flaps by knife-edges at or near the vibrating points of the diaphragm, substantially as described. A

2. The grooved plug and connecting-rods, for transferringthe motion of the diaphragm and flaps to the lever, substantially as described. A

JAMES H; MURRILL.

Witnessesz' LEWIS B. KEIZER, W. Parucraa. 

